chore(examples/integrations): float strands/langgraph starters to copilotkit 1.59.3

Version-only bump for strands-python, langgraph-fastapi, langgraph-js, and langgraph-python (package.json + lockfile); no source changes required.

Author: jpr5

examples/integrations/langgraph-fastapi/package-lock.json

@@ -14,8 +14,8 @@
   },
   "dependencies": {
     "@copilotkit/a2ui-renderer": "1.56.5",
-    "@copilotkit/react-core": "1.56.5",
-    "@copilotkit/runtime": "1.56.5",
+    "@copilotkit/react-core": "1.59.3",
+    "@copilotkit/runtime": "1.59.3",
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-label": "^2.1.8",
     "@radix-ui/react-separator": "^1.1.8",